/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.smartloli.kafka.eagle.core.sql.schema;

import com.google.common.collect.HashMultimap;
import com.google.common.collect.ImmutableMultimap;
import com.google.common.collect.Multimap;
import org.apache.calcite.linq4j.tree.Expression;
import org.apache.calcite.schema.*;
import org.apache.calcite.schema.impl.AbstractSchema;
import org.apache.calcite.schema.impl.ScalarFunctionImpl;
import org.smartloli.kafka.eagle.core.sql.common.JSqlMapData;
import org.smartloli.kafka.eagle.core.sql.common.JSqlMapData.Database;
import org.smartloli.kafka.eagle.core.sql.common.JSqlTable;
import org.smartloli.kafka.eagle.core.sql.function.JSONFunction;

import java.util.HashMap;
import java.util.Map;

/**
 * The query sql is defined as a structured schema.
 *
 * @author smartloli.
 * <p>
 * Created by Jul 17, 2022
 */
public class JSqlSchema extends AbstractSchema {

    private String dbName;

    public JSqlSchema(String name) {
        this.dbName = name;
    }

    @Override
    public boolean isMutable() {
        return super.isMutable();
    }

//	@Override
//	public boolean contentsHaveChangedSince(long lastCheck, long now) {
//		return super.contentsHaveChangedSince(lastCheck, now);
//	}

    @Override
    public Expression getExpression(SchemaPlus parentSchema, String name) {
        return super.getExpression(parentSchema, name);
    }

    @Override
    protected Multimap<String, Function> getFunctionMultimap() {
        ImmutableMultimap<String, ScalarFunction> funcs = ScalarFunctionImpl.createAll(JSONFunction.class);
        Multimap<String, Function> functions = HashMultimap.create();
        for (String key : funcs.keySet()) {
            for (ScalarFunction func : funcs.get(key)) {
                functions.put(key, func);
            }
        }
        return functions;
    }

    @Override
    protected Map<String, Schema> getSubSchemaMap() {
        return super.getSubSchemaMap();
    }

    @Override
    protected Map<String, Table> getTableMap() {
        Map<String, Table> tables = new HashMap<String, Table>();
        Database database = JSqlMapData.MAP.get(this.dbName);
        if (database == null) {
            return tables;
        }
        for (JSqlMapData.Table table : database.tables) {
            tables.put(table.tableName, new JSqlTable(table));
        }

        return tables;
    }


}
